OOC:
Larger number is the starting number of Green dice. (2 in both cases here). The lower number is the number of Green dice
replaced with Yellow dice - This is referred to Upgrading the Skill check.
And it doesn't matter if the Characteristic or the Rank in Skill is larger, which ever is larger, that's the number of Green dice to start with and the lower number is the number of Green -> Yellow replacements.
So for your example:
Discipline (2 Will - 2 Green Dice) -> 1 Rank (1 Green to Yellow) = 1 Green 1Yellow
Cool (2 Presence - 2 Green Dice) -> 0 Rank (0 Green to Yellow) = 2 Green
(I just showed Discipline in the previous post as it was the better option for Lowhhrick. :-))
Green Dice have Advantages, Successes, and Blanks (It's a 6 sided die)
Yellow Dice have Advantages, Successes, Blanks, and Triumphs (It's a 12 sided die)